An
actual backdoor into SQL Server does exist that does not require restarting
and/or rebooting anything into single-user mode. I have done this on systems
where I did not have access but needed to check stuff.
Download PSexec tools from here. Place this on the server and then in a command
prompt execute this command:psexec -i -s SSMS.exe, or sqlwb.exe
This will open up SSMS as the system account that has sysadmin access to the
instance of SQL Server. This is done during installation of SQL Server, however
I have heard that this will not be so with SQL 2012.
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